Calling a GIF (java/actionscript) on a Flash rollover?

Granted, I'm just a beginner with Flash. However, I have found and modified a Flash 3d wall that I like, and now I only have one obstacle to getting it all working properly.

Here's what I'd like to do. I want a MouseOver event to trigger an actionscript/javascript that will pull open a GIF, JPG, or whatever else file that I want, so that it's basically a hovering image that can also be clickable, and then fade/disappear if not clicked after a specified time.